Method of preparing articles such as valve-stem pads for inner tubes



Jan. 10, 1928. 1,655,879

c. c. sHlPMAN METHOD OF PREPARING ARTICLES SUCH AS VALVE STEM PADS FORINNER TUBES Filed April 26- 1926 lid Patenteddan. it), limit it tit h tE d cent 0. sr-rrrrrara, or

31d, OHIO, AElidIG-Ntltllt TO THE I. FrDOIDl't-ICH. CGMPANY, OF

Application. filed April 2.6, 1926. Serial No. %,600.

This invention relatcsto the art of preparing articles such aslun'iinated valve-stein pads for inner tubes.

Finch pads usually are composed of a base layer of sheeted rubber anddiainonchshaped laminae ot rubberized Fabric ot successively smallersize superinuwsQd upon the base layer and adheriiur thereto, and acommon practice prior to my invention was to die out the rubber basesheet in, oblate Form, to build up the fabric lamina: as a separateunit, and tl'iereaitter apply the fabric units ot successive pads tosuccessive ase sheets while the latter were carried on a conveyor belt,and thereafter to book the finished pads between liners fortransportation or storage.

.ll n this prior practice the base sheets, because of their oblate,curvilinear form, which was considered necessary tor pro rer adhesion ofthe margin of the base sheet 01 the valve-stein pad to the inner tubeblank, were cut with a substantial amount oi? waste and with acomparatively large amount of labor, and a great seal. ott labor wasinvolved also in the application oil": the fabric units and the bookingof the product.

My chieit objects are to reduce the amount of waste and to eil'ect aneconomy of labor in the manipulation of the stock to produce thevalve-stein pads or the lilre and in the manipulation 01- the product.

i attain these objects, in my preierrcd procedure, by runnin a longsheet of rubber through a slitter to produce parallel strips oi rubberrunning the strips in sidc-by-side or edge-to-edge relation through arotary bias-cutter to cut them into diamond-shaped blanks, andmaintaining; the blanks in the relative positions which they occupied inthe original sheet while applying to them the fabric units, after whichthe resulting; valvestern pads may be interwound with a liner while keptin such relation orn'iay be otherwise manipulated for transporting themto the tube building station and incorporating them into the tubes.

U1: the accompanying drawings:

Fig. 1. is a perspective view of parts of a slitter adapted to cut therubber sheet into parallel strips in the practice of my invention in.its preferred term, and oil the worlr therein.

Fig. 2 is a perspective view of parts of a rotary bias-cutter adapted tocut the paninc; at the fabric units on the rubber foun- (lation sheetsor blanks.

Fig. 4 is a face View ot the complete valve stem pad ready forincorporation in a tube.

Referring to the drawings, the initial rubber stock sheet is shown inFig. l. at 10 in process oi. being; drawn from. a suitable source ofsupply not shown) and run through a slitter coin nising a platen-roll 11and rotary cutters 12, 12 coacting there with to slit the shoot it)longitudinally into parallel strips 13, 13 each. of a width suitable forreaches of its side edges to constitute two parallel edges or adiamondshaped blank ot' the desired size.

The strips 13 are shown in process of being interwound, in theedge-to-cdge positions which they occupied in the original sheet 10,with a liner ,l l drawn from a suitable source of supply (not shown),onto a rollcore or wind-up roll 15, which readily may be done byproviding a roll 16 adapted with the platen-roll 11 to constitute a pairof: cradle rolls and mounting the wind-up roll thereon as shown so thatit will be periphorally driven thereby.

In Fig. 2 17 is the cutter-roll and 18 the platen-roll of a rotarybias-cutter, the cutter-- roll being; provided with helically disposedknives 19, 19 thereon adapted concurrently to out each of the rubberstrips 13 into a string of diamond-shaped valve-pad bases 20, 20 as thestrips 13 are fed over the platenacoll 18 and between it and thecutterroll 17', the strips 13 being freed from the liner 14 of Fig. 1and drawn to the rotary cutter in side-by-side relation, which read--field of blanks thereon is wound into a roll such as the roll 23, ofFig. 3.

The roll 23 is then mounted in bearing brackets 24, 24 rising from oneend of the to adhere thereto by pressure of the rewind- ;lng.

The resulting valve-stem pads are such asthat shown at 28 in Fig. 4, andthe valvestem pads as 21 Continuous field pass onto the roll-core 26with the liner 21, providing astock-roll which readily may be transport-",ed to the tube building station and lrom which they readily may bewithdrawn in 'e'onvenient relation for picking them off of "the liner 21and incorporating them into the tubes.

. 'I do not wholly limit my claims, however to rolling and 'un-rollingthe stock between operations thereon.

The procedure described eliminates wastage of stock, provides for themounting of the fabr c units upon the rubber blanks hile the latter aresupported in such delinite and close relation to each other as tofacilitate the accurate positioning of the ,fabric units, and providestor rapid cutting of the rubber blanks by progressively-acting rotarymeans. Theclose relation in which the rubber stock units are maintainedavoids wastage of liner space, or other blank-suporting space, Withconsequent economy.

landling ot' the rubber blanks is avoided,

so-that its adhesiveness is not impaired.

My invention issubjeet to modification without sacrifice of all of itsadvantages,

and I do not wholly limit my claims to the exact procedure described.

I claim:

1. The method of preparing laminated stock units for the manul'acture ofrubber articles which con'iprises cuttinga sheet of stock along linessuch as to produce without waste a field oi blanks substantiallyroextensive with the sheet and superimposing a stock unit upon eachblank while the blanks are maintained in substantially the same relativepositions they occupied in the original sheet.

2. The method of preparing valve-stem patches which comprises cutting asheet of rubber on numerous intersecting lines such as to divide thesheet into numerous blanks 0t like configuration and maintaining thesaid blanks substantially in the relative positions which they occupiedin the original sheet while applyingto each blank a t'ahrie reinforcingunit.

3. A method as defined in claim 2 in which the cutting steps 1 rectfectcd progressively along the sheet.

4. The method of preparing valve-stem pads which comprises cutting asheet of stock to produce a field of blanks in ranks and files andoccupying substantially the same relative positions they occupied in theoriginal sheet, maintaining them in such relation While applyingrespective units of stock thereto, and thereafter manipulating theresulting field of composite units substantially as a continuous sheetot material.

5. A method as defined in claim l in which the field 0t blanks is rolledin av liner.

In witness whereol I have hereunto set my hand this 22nd day of April,19:26.

CARL C. SlalllitlAN

